It will be a year of not-as-bad numbers for home values. Zillow’s home-value forecast released on Thursday predicts a drop of 3.7% this year, which only looks like an improvement when measured against the 4.7% drop in 2011. Some markets hammered by the housing bust, such as Phoenix, Los Angeles and Riverside, Calif., should bottom out for home values in 2012, according to Zillow, and might even see a slight increase in values. But...